Potential use of phosphorus saturation degree as combined indicator for crop yield and leaching risks at regional scale

文献类型： 外文期刊

第一作者： Gu, Yu

作者： Gu, Yu;Ros, Gerard H.;van Doorn, Maarten;de Vries, Wim;Gu, Yu;Zhu, Qichao;Shen, Jianbo;Gu, Yu;Zhu, Qichao;Shen, Jianbo;van Doorn, Maarten;Cai, Zejiang;Xu, Minggang;Cai, Zejiang;Xu, Minggang

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关键词： Phosphorus; Phosphorus saturation degree; Crop yield; Leaching risk; Long-term experiment

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2024 年 161 卷

页码：

收录情况： SCI

摘要： To ensure the sustainable use of phosphorus (P) fertilizers it is necessary to develop P management strategies that maximize crop yield while minimizing P leaching. Current P management practices, based on single agronomic soil P tests such as Olsen P (POLSEN), do not consider the P sorption capacity allowing one to predict soil P dynamics in response to long-term P inputs and related impacts on crop yield, P uptake and P loss. The oxalate extraction method, measuring contents of P, aluminium (Al) and iron (Fe), has been identified as a high-potential agri-environmental P test as it measures the reversibly sorbed P pool. This test gives insights in the plant available P pool, the P sorption capacity and the degree of P Saturation (PSD). In this study, we evaluated the performance of POLSEN and PSD in explaining crop yield and P leaching risks, using long-term field experiments from China (n = 1) and Europe (n = 11), and we applied these insights to an inventory dataset (grid-sampling based) of Qiyang county in China. The variations in crop yield and P leaching risk were better explained by PSD (R-2=0.5-0.95 for crop yield and 0.84-0.95 for P leaching risk) than by POLSEN (R-2=0.68-0.93 for crop yield and <0.73 for P leaching risk). The PSD target level to achieve 90 % of the potential yield was higher than the critical level to avoid enhanced P leaching for the Chinese but not for the European experiments. When applied on regional scale, we showed that the use of POLSEN might underestimate P demand for crop production and overestimate the potential leaching risk. Considering the theoretical advantages of PSD as a combined agrienvironmental soil P test, we discussed the implications of its use for regional P management and showed that the alpha value, which is used to estimate PSD from oxalate extractable Al and Fe, needs to be adjusted for regional pedogenic and related climate factors.

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